r 5193 ) 
cioation, and confequ€ntIy,tliat in Mixt Bodies there is no Fixr 
Alcalifat fait at all, that is originally fuch^ but that all VolatU 
Salts are fixed by Calcination^ by means of which the Earthy 
parts in them commixed are concoagulated with them 5 and 
that upon this ground the VoIatUifation of Fixed Salts may be 
eafily performed by onlf feparating from them that Fixing 
Earehj faid tobe commixed with them. 2. That intheVo- 
latilifation of Salt of Tartar, performed by the Fermentation 
of Dr. Langelot^m not chiefly the Fixed Alcali of Tartar, thafi 
is again volatilifed, but rather the €rude Tartar added for a 
ferment. 3* That in Sal Armoniac there arc only thofc two 
Salts, which he calls an Urinous and Acid, and bothVolatil j 
whereas *tis well known, that there is a Sea-falt in it, which 
contains many parts, that will for a long while endure a 
ftrong fire. 
Some Obfervations touching the Nature (jfSnow, prefinted to the 
R. Society by Dr* Nehemiah Grew, 
IF thofe great Philofophers,^r^<?//i5 and GarteJiHt^md others, 
of their Followers, who have written of Meteorsy zhA Z'- 
mongft them of Smw^ have not yet given us a full account 
hereof s it will not be needlefi to enquire further of it. He 
that will do this, will do it beft^not by tlie purfuit of his phan- 
cy in a Chair, but with his Eyes abroad s where if we ufe them 
well fixed, and with good Caotion , and this in a thin, calm 
and ftillSoow, we may by degrees obferve 5 
Firi?, with Monfieur Des Cartes, and Mt.Hook^^ that many 
parrs hereof are of a regular figure^for the moft part^as it were, 
fo many litcle Rowells or Stars of 6 points ; beiog perfeiJ: and 
tranfparentlce,as any we fee upon a pool or veffelof watcr.Up? 
on each of thefe 6 points,are fet other collateral poiatS5& thofe 
always at the fame angksjas are the main points themfelves. 
isSext^ amongft thefe irregular figures, though many of theni 
arc large and fair ; yet,from thefe taking our firft Item^ many 
cthersjalike regular ^but farlefs^may likewifebedifcover^d. 
Again^ amongft thefe not only regular^ but entire parts of ^ 
Snow^ looking ftill more warily, we (hall perceive^that there 
are divers others, indeed irregular^ yet chiefly but the broken 
pointSj parcels and fragments of the regular ones. 
Aaaa aa 2 ^ i^/r, 
